Best Radon Testing & Mitigation in St. John's

About Radon in St. John's, Newfoundland and Labrador

Last updated: March 2026

St. John's is served by C-NRPP certified radon professionals listed on RadonFinder.ca. Newfoundland and Labrador has above-average radon risk driven by the province's uranium-rich Precambrian geology. The Avalon Peninsula, home to St. John's and a large share of the province's population, sits over ancient gneiss and granite that produces elevated soil radon. Homes on the island portion of the province are often built over bedrock with minimal soil buffer, and the province's cold, windy climate means structures are well-sealed during the long heating season. Health Canada surveys show a meaningful portion of NL homes exceed the guideline.

Typical Mitigation Cost in Newfoundland and Labrador

$2,500–$4,200

Above national average

Higher costs reflect limited contractor availability outside St. John's and the island's older housing stock, which often requires more sealing work.

  • •Bedrock proximity: many NL homes are built over or very close to exposed rock
  • •Older construction with rubble or block foundations common in St. John's
  • •Limited contractor availability outside of the Avalon Peninsula
  • •Complex pipe routing in row houses and older attached homes
  • •Weather considerations during installation in coastal communities

Showing 1–2 of 2 professionals in St. John's

Pinchin Ltd.

St. John's, NL
5.0(4)Google

Pinchin Ltd. is a C-NRPP certified radon testing professional serving St. John's, NL. Their certified inspectors provide accurate radon measurements for homes and businesses.

Testing
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Shane Hickey

St. John's, NL

Shane Hickey is a C-NRPP certified radon testing professional serving St. John's, NL. Their certified inspectors provide accurate radon measurements for homes and businesses.

Testing
CallView Profile

Local radon data

How common is high radon in St. John's?

High

1 in 4

homes in the St. John's area are estimated to have radon above Health Canada's action level of 200 Bq/m³. Your home can be very different from its neighbours, so the only way to know your level is to test.

St. John's
1 in 4
Newfoundland and Labrador
1 in 4.6
Canada
1 in 5.6

Postal areas nearby with the highest estimates

Estimate across 13 postal areas. Source: the RadonFinder.ca radon map of Canada, built on the 2024 Cross-Canada survey, Health Canada data and Statistics Canada census data.

Open St. John's on the radon map

Test before you call a pro

Know your radon level in St. John's first

A home monitor tells you whether you need mitigation at all, and later confirms it worked. Health Canada bases decisions on a 3-month average, ideally through winter.

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Frequently Asked Questions: Radon in St. John's

RadonFinder.ca lists C-NRPP certified radon testing and mitigation professionals serving St. John's, Newfoundland and Labrador. Browse the directory above to compare professionals by services offered, certifications, and reviews.
Most homeowners in Newfoundland and Labrador pay between $2,500 and $4,200 for a complete radon mitigation system. Actual cost depends on your foundation type, home size, and the complexity of the installation. Request quotes from multiple professionals to compare.
St. John's follows Health Canada's national guideline of 200 Bq/m³. If your home tests above this level, Health Canada recommends taking action to reduce radon within two years for levels between 200 and 600 Bq/m³, and within one year if above 600 Bq/m³.
Yes. Health Canada recommends testing every home in Canada, regardless of age, construction type, or location. Radon levels vary from house to house and even neighbouring homes can have very different readings. A long-term test of at least 91 days during the heating season is the most reliable method.
The most common system is active sub-slab depressurization (ASD). A certified professional installs a pipe through your foundation slab connected to a fan that draws radon from beneath the home and vents it safely above the roofline. Installation typically takes one day.

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Radon Resources for St. John's

Tools and guides to help you understand radon risk and take action.

Check your radon risk
Estimate your risk based on province, home age, and foundation type.
Understand your test results
Learn what Bq/m³ means and when action is required.
DIY radon test kits
Compare test kit options starting from $10.
Radon guides & articles
In-depth guides on testing, mitigation, and health risk.
Radon map of Canada
See how common high radon is in your postal code.
Radon FAQ
Answers to the most common questions about radon.